Prolonged dual antiplatelet therapy in an extended Phase 3 Cardiac Rehabilitation Program following myocardial infarction

Abstract Background Prolonged dual antiplatelet therapy (P-DAPT) is recommended in selected patients beyond 12 months after myocardial infarction (MI). Several risk scores have been developed to estimate the ischemic and bleeding risk and individualize the decision-making process. Purpose We aim to analyse the factors, including ischemic and bleeding scores, associated with P-DAPT prescription in MI patients submitted to a Cardiac Rehabilitation Program (CRP). Methods Patients with ST-segment elevation MI (STEMI) or occlusion MI (OMI) who were submitted to our CRP underwent Phase 2 CRP and were prospectively included. Patients were followed in an extended Phase 3 CRP, and a follow-up visit was scheduled 12 months after hospital discharge. Baseline and follow-up clinical characteristics and treatment after the 12-months visit were registered, specifically P-DAPT. Ischemic (DAPT score) and bleeding (PRECISE-DAPT and CRUSADE scores) risk scores were retrospectively computed. Predictors of P-DAPT were studied by univariate analysis and multivariable binary logistic regression. The model was tested by area under the curve (AUC) analysis in receiver operating characteristic curves. A p<0.05 was considered statistically significant. Results The cohort comprised 78 patients (mean age 61±11 years, 84.6% male). Anterior and inferior STEMI were the most common presentations (43.6% and 47.4%, respectively). The most prevalent cardiovascular risks factors were hypercholesterolemia (85.9%), hypertension (53.8%), smoking habit (46.2%) and diabetes mellitus (23.1%). P-DAPT was prescribed in 39 (50%) patients beyond 12 months after MI, primarily combining aspirin 100mg o.d. and ticagrelor 60mg b.i.d. (n=33, 84.6%). On multivariate analysis, variables associated with P-DAPT prescription were hypertension (HR 4.92 [1.37-17.68], p=0.02), diabetes mellitus (HR 5.13 [1.09-24.09], p=0.04), multivessel disease (HR 5.54 [1.55-19.79], p=0.008), and stent diameter <3mm (HR 5.46 [1.25-23.78], p=0.02). The predictive power of the model was excellent (AUC 0.88 [0.8-0.96], p<0.001). Ischemic (DAPT score) and bleeding (PRECISE-DAPT and CRUSADE) risk scores were not associated with P-DAPT neither in continuous form nor by using their standard cutoffs (≥2, <25 and >40 points, respectively). Conclusions In a real-life cohort of MI patients undergoing extended Phase 3 Cardiac Rehabilitation, P-DAPT was prescribed in half of the population. Clinical (hypertension and diabetes mellitus) and angiographic (multivessel disease and stent diameter <3mm) variables straightforwardly predict the likelihood of receiving P-DAPT, unlike ischemic and bleeding risk scores. The clinical consequences of this management should be further explored.Prolonged DAPT in Cardiac Rehabilitation